Relieving attachment



- Sept. 17, 1940.

Original Filed Dc t. 29. 1937 6 Sheets-Sheet 1 INVENTORS. WILLIAM FGROENE WILLARD LGROENE ATTORNEY.

Sept. 17, 1940.

W. F. GROENE' ET AL RELIEVING ATTACHMENT Original Fil'ad Oct. 29, 193

6 Sheets-Sheet 4 INVENTCYRS. WILLIAM F. QROENE WILLARD L. QROENE ATTQRNET.

Sept. 17, 1940. v w. F. GROENE ET AL RELIEVING ATTACHMENT Original Filed -Oct. 29, 195'."

6 Shets-Sheet 5 INVENTORS. W\LL\AM F. GROENE 3m j N5 rpm/m #3. 3m Sm 3 J W xan 5m 1 E M 3m m 3n m w 1 $3 I van amm-

Y MLLARD L. GROENE ATTORNEY.

Sept. 17, 1940. w. F. GROENE ET AL RELIBVING ATTACHMENT 7 Original Filed 001;. 29, 1937 6 Sheets-Sheet 6 FIQYH INVENTORS.

GROENE LARD LQROENE ATTORNEY.

Patented Sept. 17, 1940 UNITED STATES PATENT' OFFICE REIJEVING ATTACHMENT William F. Groene and Willard L. Greene, Cincinnati, Ohio, assignors toThe R. K. Le Blond Machine Tool Company poraticn of Delaware ('Jlncinnati,v Ohio, a cor- Original application October 29, 1937, Serial No.

Divided and this application November 22, 1939, Serial No. 305,704

4 Claim.

feed box, which is carried on the lathe head-' stock, to mount and drive the driving and change gear mechanism for operating a relieving attachment.

Further features will be described in detail and additional features will be pointed out in the following description.

In the drawings:

Figure I is a front elevation partly in section of the feed box on line II of Figure III, showing the general arrangement of the transmission and control mechanism.

Figure 11 is a vertical elevation of the right hand end of the feed box showing the spade handle and indexing and locating plate for positioning the tumbler pinion cylinder.

Figure III is a vertical elevation of the feed box as shown in Figure II but with the indexing and locating plate removed to show the interior arrangement of parts and driving connection from the headstock interior.

Figure IV is a diagrammatic sectional view on the line IV-IV of Figure III showing in detail the arrangement of the gearing and construction of the-tumbler operating mechanism.

Figure V is a top diagrammatic plan view of the feed box showing the arrangement of the driving mechanism for a relieving attachment.

Figure VI is a front elevation of the feed box with the relieving attachment driving mechanism attached.

Figure VII is a left hand end view of the feed box showing the arrangement of gearing utilized for driving the relieving attachment and the carriage control box when relieving with standard threads and feeds.

The novel feed box transmission of our invention is completely enclosed in the feed box land is flooded by lubricant derived from the headstock interior through the opening 4a which matches a similar opening Id of the feed box I, Fig. IV.

The feed box is mounted on the front of the headstock 4, conveniently located with respect to the operator, The feed box 2 has an accurately Ina-'- chined locating face 2lll adapted to abut against an accurately machined locating face 2 provided on the front wall of the head stock 4. Suitable bolts 2 are provided passing through the integral flanges 212 and 2 of the feed box 2 into appropriate tapped holes in the locating face dlally extending slot 2 of the headstock 4, to thereby securely hold the box to the headstock and provide a lubricanttight connection between the faces 2" and2l I.

Referring drive for the feed box is derived from a. gear I28 in the interior of. the headstock 4 which drives the gear 2 I 5 which is fixed in driving relation on the tumbler cylinder drive shaft H8. The left hand end,*Fig. IV, ofthe shaft 2| 6 is Journaled in a suitable anti-friction bearing 2| 1 mounted in the left hand wall 2" of the feed box 2. A nut 2|! particularly to Figs. III and IV, the

threaded to the shaft '2l6' securely holds the inner race of the bearing 2 and driving gear 2|! securely against the integral annular flange 22!! of the shaft H6. The bearing 2" is held in fixed axial position in the wall 2!! by the oil seal ring 22f having'the oil seal 222, by holding the outer race of the bearing 2"" against the shoulder 222 of the bore 224. The shaft 2l8 is thus held from axial movement, the bearing 211 being of a character to prevent substantially all axial movement in the shaft. The right hand end of the drive shaft 2I6 is provided with splines 225 -which are slidingly supported in a suitable mating splined bore of the tumbler pinion 222, which arrangement provides support for the drive shaft 2ll.to hold it in proper axial alignment.

The feed box 8 has a very unique construction 220 in the locating and indexing plate 22l, which plate is secured to the right head end 22loof the feed box 2 by suitable screws 22"). The tumbler pinion 226 is iournaled on suitable anti-friction bearings 222 and 222 in the relatively large bore 224 in the tumbler cylinder 221. A locating collar 22! fixed in the bore 234 adjacent the bearing 222 confines the bearings 222 and 222 and the tumbler pinion 228 between the inner face 236 of the bore 224 and the face 221 of the locating collar 2" to thereby prevent substantially all axial movement in the bore 224 of the cylinder 221. The tumbler gear 222 is iournaled on the pin 228 fixed in the radially. extending bosses 240 and 2 formed integral with the cylinder 221. The ra-. 242 between the bosses 242 and 2 extends into the bore 224 and provides means for the pin 229 to thereby'maintain driving engagement between the tumbler pinion 222 and the A clearance bore cylinder 221 for axially positioning the gear 222 on the extended splined end 2250f the drive shaft The cone gear shaft 244 is journaled in an antifriction bearing 245 mounted in the left hand wall 2 l 6 of the feed box 6 and in an anti-friction hearing 246 mounted in the locating and indexing plate 23f. An intermediate anti-friotionbearing 241 for supporting the shaft intermediate the bearings 245 and 246 is mounted in the partition 229 of the feed box 6, the bearing retainer 248 serving to properly adjust the bearings 245 and 246. A cone of gears 249 is fixed to the shaft 244. by means of a suitable proper axial position on the shaft by the lock nut 25f which binds the cone of gears 249 against the shoulder 252 of theshaft 244 adjacent the bearing 241. V

We provide a very novel and easily operated control means for causing the tumbler gear 236 to selectively engage the various gears of the cone of gears 249. A manipulating handle 253, of a shape similar to that of a spade handle, has a cylindrical lug 254 snugly fitting in the bore 255 in the right hand end of the tumbler cylinder 221 and secured in place by means of the pin 256. It can thus be seen that the manipulating handle 253 for rocking and axially moving the tumbler cylinder 221 is located substantially on the axis of the cylinder 221.

We provide a unique arrangement for promoting easy selection of tubular gear positions of cone gear engagement and for securely holding the tumbler gear in selected position. In the manipulating handle 253 is provided a plunger 251, in a diametral bore 256, which has a tapered end 259 adapted to engage mating tapered locating and indexing holes 266 located in an arcuate projection 261 formed integral with the plate 23! and having its radius-of curvature-of its upper surface 26ia substantially concentric with the axis of the cylinder 221. A spring 262 secured in the bore 256 by means of the threaded plug 263-, yieldingly urges the plunger 251 radially outward relative to the axis of the tumbler'cylinder'221 to there by hold the tapered end 259 of the plunger 251 in secure engagement with the various tapered holes 266. A trigger 264 pivotally mounted on a integral arm I ing slot 266 in the plunger 251 provides means for withdrawing the plunger from the tapered holes 266 when selecting the various gear changes.

It is to be clearly noted that with the handle 256 gripped with the hand'and the plunger'251 withdrawn by pressure of the fing rs on the trigger 264 the cylinder may be rotated circumferentially and moved axially" to select the desired gear change. It is to be clearly noted that since, the handle 253 islocated substantially on the axis of the cylinder 221, axial movement of the cylinder by, means of the handle causes no binding or cocking of the cylinder in its journals 226 and 236 as is encountered in all of the prior conventional feed change boxes. Another important improvement over'prior'constructions is the location of the point of engagement .of the indexing pin 251 with the tapered holes ,266 radially far removed from the "axis of the cylinder 221 while at the same time having the plunger closely coupled and located relatively near to the tumbler gear 236, not relatively far removed on the end of the manipulating handle as in prior construc- In order to facilitate obtaining the proper gear selection, an inclined portion 269 of the arcuate integral lug key 256 and is secured in in the handle 253 and having an 266 with a rounded end 261 engag-' projection 26!, facing outward and upward transverse of the lathe, has formed on its upper edge 216 a series of gear change-finding notches 21| corresponding in number and relative position to the gear changes obtainable from the cone of gears 249. On the handle.253 is formed an 212 having an arcuate indicating blade 213 with a curvature concentric with the axis of the cylinder 221 and of a width to pass with ample clearance through the slots 2" when the cylinder 221 is rotated. A cut-away portion 214 is provided in the indicating blade 213 so that when the handle 253, Fig. 11, has been rotated to its extreme clockwise 215 of the handle 253 is in contact with. the portion 216 of the inclined portion 269, the cutaway portion 214 will then permit the handle and v position sothat the end cylinder to be shifted axially. An index plate 211 secured to the inclined portion 269 has columns 216 coinciding with the various notches 211 which show the various threads and feeds obtainable in each of the notches selected.

The operation of shifting the cylinder is rela- I 'tively simple. The operator grips the handle 253 and depresses the trigger 264 thereby releasing the plunger 251 from tapered hole 266. The operator then rotates the handle clockwise, Fig. II, until the end 215 of the handle 253 engages the surface 216 of the inclined portion 269 and at the same time removing the indicating blade 213 from an indicating slot 21l. Under these conditions the cylinder 221 is free to be moved axially in either direction its maximumtravel. The desired thread or feed is selected on the index plate and the handle 253 is moved axially until the blade 213 is positioned over the slot'21l coinciding with the column of the index plate in which the desired thread or, feed is found. The operator then merely rotates the cylinder counter clockwise which automatically causes t'he plunger 251 to engage in the proper tapered hole 266 to properly mesh the tumbler gear 236 with the cone of gears 249. ing notches 211* and indicating blade is to enable the operator to quickly and easily determine the proper setting of the tumbler cylinder relativeto the index plate, a feature distinctly lacking in all prior constructions. This arrangement also prevents improper meshing of the tumbler gear 246' with the cone of gears 249 and also avoidsthe necessity of jiggling the cylinder 221 in order to find the proper tapered hole 266 for the locating plunger 251.

In order tov provide a widerange of threads and feeds beyond the scope obtainable by means coarse speed changes in the feed box 8 in addition to the gear changes just described. On the cone gear shaft 244 and integral therewith between the bearings 245 and 241, and adjacent the latter, if formed a twelve tooth pinion 219. Adjacent the pinion 219 is secured to the shaft 244 a compound gear 266 comprising the small twenty-tooth gear 28| compound gear on the shaft 244 by means of the key 263. the compound gear 266 and thelarger thirty-tooth gear 262, the

Between feed box 8, journaled in an anti-friction bearing 266 being fixed in drivingrelation and the bearing 243 is, joumaled the compound gear 284, comprising the The main advantage of the indicatof the cone of gears 249 we provide a series of I 290 mounted in the wall M8 and journaled in an anti-friction bearing 29! mounted in the partition 229. The bearing retainer 292 having the lubricantseal 295serves to properly adjust the bearings 290 and 29l to eliminate substantially allfifteen-tooth pinion 294. .Adjacent the pinion 294 is rotatively mounted a pinion sleeve 295 having a bearing bushing 296 fixed in itsbore 29! adapted to revolve on the bearing portion 298 of the shaft 289. Between the pinion sleeve 295 and the bearing 29! is rot'atively mounted the clutch gear 299 having a bearing bushing 300 fixed in its bore 30! adapted to revolve on the bearing portion 302 of the shaft 289. The clutch gear 299 comprises a forty-eight-tooth gear 299a. adapted to constant engagement with the twelve-tooth pinion 219 of the shaft 244. Mounted for axial movement on the pinion sleeve 295 is a compound gear 303 adapted to drive the sleeve 295 by means of a key 304 fixed in the sleeve and having sliding engagement in a suitable keyway in the compound gear 303. The compound gear 303 comprises a small thirty-tooth gear 305, a large forty-tooth gear 306, and clutch teeth 30! on the face of the gear 306. When the compound gear 303 is shifted axially to its extreme left position, Fig. IV, the gears 305 and 282 will be brought in driving engagement, when shifted to its intermediate position, as shown in Fig. IV, the gears 306 and 28| will be in driving relation, and when the compound gear 303 is shifted to its extreme right position the clutch teeth 30'! will engage mating clutch teeth 308 on the face of the gear 299a, only one of the above combinations being engagable at a time.

Formed integral with the pinion sleeve 295 and adjacent the pinion 294 is a fifteen-tooth pinion 309 of the same. dimensions as the pinion 2 94 of the shaft 289, a portion of the pinion 309 removed from the pinion 294 being adapted to constant driving engagement with gear 285. On the pinion 294 is mounted a forty-tooth gear 3I0 having a bore3l| which is an internal gear snugly fitting about the teeth of the pinion 294 but permitting thegear 310 to be shifted axially of the shaft 289. When the gear 310 is shifted fully to the left, as shown in Fig. IV, it will be supported only on the pinion 294 and will then be in driving engagement with the gear 286. When shifted fully to the right, the gear 3 I0 will be disengaged from the gear 286, the internal gear bore 3 of the gear 310 will then engage over the portion of the pinion 309 adjacent the pinion 294 so as to provide a positive driving connection between the shaft 289 and pinion sleeve 295.

In noting the specific example of gear. ratios here illustrated we wish topoint out thevery wide range of speeds obtainable from this arrangement. A series of speed changes, between the cone shaft 244 and feed output shaft 289, in ratios of from one to thirty-two-to-one are obtained as follows: With the gears 3I0 shifted to-the right so that the sleeve 295 is connected in direct driving relation to the output shaft 289, engagement of gears 282 and 306 provides a l-to-l ratio; engagement of gears. 28! and 306 provides a 2-to-1 ratio; and engagement of the clutches 301 and 308 provides a 4-to-1 ratio. With the gear 3i0 shifted to the left engaging the gear 286 an 8-to-1 ratio is provided from the sleeve 295 and the output shaft 289 through the gears 309 driving gear 285 and gear 286 driving gear 294; so that engagement of gear 282 and 305 provides an 8-to-1 ratio; engagement of gears 28l and 306 provides a ratio of 16-to-l;

, and engagement of the clutches 301 and 308 provides a 32-to-1 ratio. Intermediate ratios between the. six major ratios just noted are obtained from the cone of gears 249 cooperating with the tumbler gear 238 as already described.

While we have'cited specific gear ratios in this illustration to more clearly give some idea of the wide range of feeds and threads obtainable from this novel, compact feed box transmission, it is to be clearly understood that we are in no way limited in the scope of our invention to the specific example herein disclosed.

The means for selecting the six major speed changes of the feed box transmission noted above comprises a control handle 3l2, Figs. I, II, III,

V and VI, fixed to the transversely located rock shaft 3l3 journaled in the front wall 3 and rear wall 315 of the feed box 8. On the shaft 3l3 is fixed a gear 3l6 between the walls 3l5 and 3l4 and adjacent thelatter wall 3l4 which is adapted to engage a rack 3" formed on the top of the longitudinally located shifter rod 3|8, the rod 3| 8 being mounted and axially slidable in the wall 2I8, in the partition 229, and in a boss, 3l9 formed integral with the wall 23|a of the feed box. Fixed to the rod 3l8 intermediate the wall H8 and partition 229 is a shifter yoke 320 adapted to contact the compound gear 303 in the annular slot 3l2. Thus, by moving the handle 3l2 to the right or left the rod 3l8 through the rack 3|! and gear 3l6 will be moved axially and by means of the shifter yoke 320 the compound gear 303 can be easily shifted to the respective positions already discussed. Indicating letters A, B, and C, shown in Fig. VI, are provided to show the position selected relative to the feeds and threads obtained as shown on the indexplate 211. These positions are shown in column 32f of the index plate2'll. A detent arrod 330 by a spring 333 in a suitable bore 334 in the boss 3l9 engages in the notches'335 when proper shifted positions are selected. Indicating letters, D, and E, shown in Figure VI, are provided to show the position selected relative to the feeds and threads obtained as shown on the index plate 211. These positions are shown in column 336 of the index plate. 211. 7

It can thus be seen from the above description that we have herein provided a feed box transmission of compact design, and having a very wide range-of feeds and threads which has a system of control levers simple and easy to operate and which are conveniently located for the operator in close association with the control means for the headstock. It is unnecessary for the operator to bend over in order to read the index plate or make the necessary manipulations of the control levers of the feed box as is an inherent defect in all prior constructions.

The driving power from the feed box 8 to the carriage control box 9 is transmitted through a series of conveniently located change gears at the left hand end of the lathe. This drive comprises the helical change gear 331 which is removably mounted by suitable splined drivin connection 338 and is securely held in place by the nut 338 threaded to the end of the output shaft 289. In Fig. VII, the standard change gear transmission from the feed box 8 to the carriage control box 9 would consist of the helical change gear 331 on the output shaft of the feed box 8 driving a helical idler gear removably mounted on the stud 341 adjustably secured to the quadrant 342, the idler gear in turn driving a gear of the same size and number of teeth as the gear 331 and removably mounted on the drive shaft 344 by means of the nut 345 in the same manner provided for mounting the gear 331. Thequadrant is supported and clamped by suitable bolts 346 passing through elongated holes 341 in flanged portions 348 of the control box 9 so that various sized change gears can be applied to the feed box output shaft 289, the control box drive shaft 344, and the quadrant stud 341. The gearing just described is the standard arrangement utilized in operating the lathe in low back gear, high back gear, and high spindle speeds when it is desired to obtain the standard ranges of feeds and threads for use with these spindle speeds. When it is desired to obtain metric threads and feeds the usual metric transposing gear transmission may be substituted for the gearing described, the gears being made with helical teeth and of relatively wide face to insure quiet running and long life. The wide faces also permit applying compound gears of normal width of face to the quadrant stud 341. Any desired odd feed and lead of thread may be obtained with this lathe by merely applying the proper gearing in place of these gears.

Relieving attachment driving mechanism Through the medium of our novel feed box transmission mounted on the headstock we are able to provide a unique driving mechanism for operating a relieving attachment. This driving arrangement can be attached to the lathe and adjusted more conveniently and is of.a much more simplified construction than the more conventional driving mechanism necessary to operating relieving attachments for lathes.

Referring particularly to FigaIV, V, VI and VII, we here illustrate the novel driving mechanism adapted to driving a relieving attachment, as for example the relieving attachments described in Patent 980,975 issued Jan. 10, 1911, and in Patent 1,586,827 issued August 17, 1926. The drive shaft 216 of the feed box 8 has a splined extension 351 to. which may be applied a change gear 332 removably secured in place on the shaft 213 by means of the nut 353 threaded to the shaft. In the normal operation of the "lathe, when no relieving attachment is being used, the change gear 332 and nut 333 and washer 332a. are removed from the shaft 218 and a suitable protective closure cap 334, Fig. IV, is placed over the end of the shaft, the cap being secured in the threaded bore 333 in the bearing retainer On the front wall 314 of the feed box, 8 is provided a machined mounting surface 338 having a keyway 331 and tapped holes 338. On this surface 336 a bracket 359 is mounted and secured thereto by suitable bolts 338 fitting in the tapped holes 358. A tongue 361 formed on the bracket 359 and fitting snugly in the keyway 331 serves to automatically properly align the bracket with a minimum of effort required upon the part of the operator. In the bracket 359 is fixed a bearing shaft, which contacts the respective end faces of the bearing bushing 362. On the left hand end of the shaft 361 is provided the splined connection 311 and nut 312 for mounting a change gear 313.

The splined connection 311 being of the same.

dimensions as the splined connection 351 of the shaft 216 so that change gears may be applied interchangeably to either of the shafts216 and 361. A quadrant stud 314 having the mounting nut 315 is adapted for mounting compound change gears 316 and 311 in a like manner to the stud 341 of the .quadrant 342, shown in Fig. VII. Fixed to the universal Joint 3111 is the usual telescoping driving tube 318 having a key 319 fixed in its bore and adapted to slidingly engage the keyway 3811 of the drive rod 381 as is usual for relieving attachment drives and as illustrated in Patents 980,975 and 1,596,827.

The headstock transmission is so arranged when using the relieving attachment that the feed box transmission including the shaft 216 will be rotated at five times thespeed of the headstock spindle. This speed-up of the shaft 216 produces the necessary speeds for the relieving attachment change gear transmission comprising change gears 352, 311 and 313, permitting an easy drive through these gears and permitting these gears to be of simple arrangement without the necessity of providing a relatively large speed-up in this change gear transmission. 7 The number of gears and necessary changes for the relieving attachment change gear drive is thereby greatly reduced and simplified for the operator.

Since the entire feed box transmission is running five times as fast, relative to the spindle speed, when the relieving attachment is being used, the one-to-one helical change gear drive described produces feeds and threads which will h be five times the standard feeds and threads indicated on the index plate.

Should it be desired to'have standard feeds and threads when using the relieving attachmentit is only necessary to replace this standard helical change gear set up with a speed reducing gear train which .will again bring the speed of the con-- trol box drive shaft 344 to standard speeds relative to the spindle speeds. For example, Fig. VII, in the particular lathe here illustrated a five-toone reduction gearing, comprising the fifty tooth gear 382 mounted on the output shaft 289; the compound gear comprising the hundred tooth gear 383 and forty tooth gear 384; and the hundred tooth gear 344a mounted on the drive shaft 344 of the control box 8, is utilized to obtain standard feeds and threads as indicated on the index plate when using the relieving attachment.

It can thus be seen from the above description that we have provided a relieving attachment drive mounted on the feed box and driving from s the box transmission and which is of simple fixed on said tumbler cylinder shaftadapted t clutching means for engaging the gear rotatably mounted on said output shaft, a gear slidably arrangement and easy to install ,on the lathe.

Having fully set forth and described our invention what'we claim is:

1. In a feed her: transmission for'a lathe, a

tumbler cylinder shaft, a gear fixed on said shaft adapted to be driven'from the'headstock transmission of said'lathe, a tumbler gear driven by said tumbler cylinder shaft and adapted to engage a cone of gears on a cone gear-shaft, an out- 7 put shaft, change speed gearingbetween said output shaft and-said cone gear shaft, and .a gear drive a relieving attachmentof said lathe.

2. In a feed box transmission for' a lathe, a

' tumbler cylinder shaft, a gear fixed on said'shaft adapted'to'be driven from'the headstock trans-' mission of saidlathe, aftumbler gear driven by said tumbler cylinder shaft and adapted to engage a cone of gears on a cone gear shaft, an output shaft, change speed gearing between said output shaft and said cone gear shaft, a bracket de-' mountably attached to said feed box, a shaft journaled in said bracket, change gearing between said shaft in said bracket and said tumbler cylinder shaft, and connecting means between said J shaft in said bracket and a relieving attachment of said lathe.

, the'con'e gear shaft, a sieevegear rotatable jourhaled on said output shaft and arranged in con- 3. In a feed box transmission for a lathe, a tumbler cylinder shaft, a gear fixed on said shaft adapted to be driven from theheadstock transmission of said lathe, a tumbler gear driven by said tumbler cylinder shaft and adapted'to engage a cone of gears on a cone gear, shaft, an output shaft, change speed gearing between said output shaft and said cone gear shaft comprising a pinion formed on said cone gear shaft, a small gear fixed on said cone gear shaft, and a large'gear fixed on said shaft, a compound gear rotatably journaled on said vcone gear shaft,'a gear rotatably journaled on said output shaft arranged to be in constant engagementwith said pinion of stant mesh with a gear of saidtcompoun'd gear Journaied on said cone gear-shaft, a compound gear slidably mounted on said sleeve gear having its gears arranged to engage the small and large gearsfixed on said cone gear shaft and having mounted in driving relationship on the output shaft arranged'to alternately engage a' gear of said compound gear journaled on said cone gear shaft or to engage said sleeve gear to lock said sleeve gear in drivingrelationship on said output shaft, means for-connecting said output shaft to a tool feed carriage of said lathe, and means for fconnecting said tumblercylinder shaft to a relieving attachment on said tool feed carriage.

4.-In a feed box transmission for a lathe, a tumbler cylinder shaft, 9. gear fixed'on said shaft adapted to be driven from the headstock transmission of said. lathe, a tumbler gear driven by saidtumbler cylinder shaft and adapted to engage a cone of gears on a cone gear shaft, an output shaft, change speed gearing between said output shaft and said cone gear shaft comprising a I pinion formed on said cone gear shaft, a small gear fixed on said cone gear shaft, and a large gear fixed on said shaft, a compoundgear rotatable journaled on said cone gear shaft, a gear rotatably journaled on said output shaft arranged to be in constant engagement with said pinion of mounted in driving relationship on the output shaft arranged to alternately engage a gear of said compound gear journaled on said cone gear shaft or to engage said sleeve gear to lock said sleeve gear in driving relationship on said output shaft, means for connecting said output shaft to a tool feed carriage of said lathe, a bracket demountably attached to said feed box, a shaft journaled in said bracket,'change gearing between said shaft in said bracket and said tumbler cylinder shaft, andconnecting means between said shaft in saidbracket and a relieving attachment mounted onsaid tool feed carriage.

- WILLIAM F. GROENE. ,WILLARD L, GROENE. 

